Interfacial toughness: dependence on surface roughness and test temperature

Interfacial toughness quantifies resistance to crack growth along an interface and in this investigation the toughness of an aluminum/epoxy interface was measured as a function of surface roughness and test temperature. The large strain response of the relatively ductile epoxy adhesive used in this...

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Bibliographic Details
Published in:International journal of fracture 2020-03, Vol.222 (1-2), p.1-12
Main Authors: Reedy, E. D., Stavig, M. E.
Format: Article
Language:English
Subjects:
Adhesion tests
Aluminum
Automotive Engineering
Characterization and Evaluation of Materials
Chemistry and Materials Science
Civil Engineering
Classical Mechanics
Compressive properties
Crack propagation
Crack tips
Epoxy adhesives
Fracture toughness
MATERIALS SCIENCE
Mechanical Engineering
Original Paper
Strain
Stress distribution
Surface roughness
Temperature dependence
Yield strength
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Summary:Interfacial toughness quantifies resistance to crack growth along an interface and in this investigation the toughness of an aluminum/epoxy interface was measured as a function of surface roughness and test temperature. The large strain response of the relatively ductile epoxy adhesive used in this study was also characterized. This epoxy adhesive exhibits intrinsic strain-softening after initial compressive yield and then deforms plastically at a roughly constant flow stress until it rapidly hardens at large compressive strains. We find that interface toughness scales as the product of the temperature dependent epoxy yield strength and a length scale that characterizes surface roughness. The proposed scaling is based upon dimensional considerations of a model problem that assumes that the characteristic length scale of both the roughness and the crack-tip yield zone is small relative to the region dominated by the linear elastic asymptotic crack-tip stress field. Furthermore, the model assumes that interfacial failure occurs only after the epoxy begins to harden at large strains. The proposed relationship is validated by our interfacial toughness measurements.
ISSN:0376-9429
1573-2673
DOI:10.1007/s10704-019-00419-0